Safety casing spider



Filed April 29, 1927 2 Sheets-Shen 1 2 m t l, m .0 s w w .nu m 2* w//// /z Rmw oss, |||||l|||| d Tm@ .y SYA y Td 1mm n n, 5 Z 7 ww m2@ fz@ 1v 7 2 y Patented Nov. 22, 1927.

UNITED STATES PATENT oFrIcE.

.umts s. Tanon, or

'WYNONL CKLAHOIA, ASSGNOB 0l' ONE-HALF T0 HOWARD B.- OUBSLEB, OF YONCA CITY, OKLAHDIA.

SAFETY CABIN@ SPIDER.

Application lled April 29, 1927 Serial I0. 187,085.

The invention relates to a safety casing spider. l

The object of the present invention 1s to improve the construction of casing spiders and to rovide a simple, practical and etlicient sa ety casing spider of strong, durable and comparatively ,inexpensive construction designed for use in lowering caslng into a hole and in hoisting casing out of the same and adapted to be held by an operator 1n an expanded condition to provide an opening of suicient size to permit-the couplings of a well casing to pass readily through it and capable of being instantly released by the operator and of automatically gripping and holding a casing without liability of bending, cushioning or otherwise injuring the same.

A further object of the invention is to provide a safety casing spider equipped with means for enabling the `size ofthe casing receiving opening to be readily varied for operating on casmgs of different dlameters.

With these and other objects in view, the invention consists in the construction and novel combination and arrangement of parts hereinafter fully described,y illustrated in the accompanying drawings and pointed out in the claims hereto appended, it being' understood that various changes inthe form, proportion and minor details of construction, within the scope of the claims, may be resorted to without departing from the s irit or sacrificing any of the advantages o the invention.

In the drawings Figure 1 is a side elevation of a safet casing spider constructed in accordance wit this invention. i

Fig. 2 is a plan view.

Fig. 3 is a central vertical sectional view.

Fig. 4 is a horizontal sectional view showing one of the auxiliar? liners in position for reducing the size o the opening to accommodate a smaller casing.

Fig. 5 is a detail perspective view of one of the sections of the liner.

In the accompanying drawin s in which is illustrated the preferred em iment of .the invention, the safety casing spider comprises in its construction a heavy metallic ring 1 having an interior taper 2 and rovided at opposite sides of its exterior with integral lugs or extensions 3 which are bolted or otherwise secured upon blocks 4 forming a base for the safety casing spider and designed in practice to be suitably secured upon the floor of the derrick (not shown). The interiorly tapered ring 1 which gradually decreases in diameter interiorly from its upper to its lower edge is provided with diametrically disposed dovetailed grooves 5 forming guides or ways for the reception of dovetailed ribs 6 of sections 7 of an expan sible slip movable upwardly and down wardly and ada ted to spread and close in such upward an downward movements for releasing and gripping a casing The lip 7 is composed of four sections provided with inner gripping faces preferably formed l) corrugating the inner face of the slip a clearly illustrated in Fig. 3 of the drawing. but any other suitable form of casing grip ping surface may, of course, be employed as will bereadily understood. The sections of the slip have vertical side edges and the ribs are located intermediate of the side edges of the sections and interlock the sections with the rin 1 to prevent relative rotary movement w ile permitting free upward and downward movement. The slip is tapered from top to bottom as shown and the sections are caused to move in unison in their upward and downward movements by means of horizontally dis d dowel guiding pins 9 mounted in aligned openings 10 in the vertical edges ofthe sli and tapered laterally toward one end to acilitate free movement of the pins in the openings while the sections of the sli are closing or spreading. The tapered en of each guiding dowel pin is relatively loose in one of the openings and its other end is 1preferably secured 1n the other opening. T e guiding dowel pins beside securing a uniform opening and closing action of the sections of the slip also support two of the sections and move the same upwardly and downwardly when the other two sections are raised and lowered by the operating means hereinafter described or by the action of a casing when the operating mechanism is released to permit the sections of the slip to engage the casing automatically.

The two sections on which the guiding dowel p.ns are preferably fixed are provided at their upper edges with recesses 11 in which are hinged the vupper ends of inclined upper arms 12 which are hinged at their lower ends to the upper terminals of the same.

lower arms 13. The adjacent' ends of the arms 12 and 13 are provided with registering eyes 14 and 15 through which passes a pintle 16 whereby the arms are hinged together. The upper ends of the upper arms are provided with suitable eyes 16 which are mounted on pivots 17 carried by the slip and extending across the recesses 11. The lower hinged arms are provided at their lower ends with eyes 18 which are mounted on horizontal pivots 19 consisting of rods or bolts extending across the space between the blocks 4 and piercingr the end portions thereofl and suitably secured to The blocks 4 which support and form a base for the safety casing spider are spaced apart by the lower portion of the ring l which lits between. the blocks 4, the lateral extensions or lugs 3 being located lintermediate the upper and lower ends of the ring 1. The lower hinged arms 13 are maintained in a central position on the transverse pivots 19 by spacing sleeves 2O located at opposite sides of thearnis as clearly shown in Fig. 2 of the drawings.A

The upper hinged arms 12 are provided intermediate of their ends at their upper portions with transverse eyes 21 which receive pivots for connecting the upper hinged arms to the upper endsof links 23. The links 23 have their upper ends bifurcated and providedat opposite sides of the bifurcation with eyes 24 which receive the said pivots. The lower ends of the links are reduced and provided with eyes 25 which receive crank bends 2G of transverse rocking shafts 27 and 28 journaled in suitable bearings on the blocks 4 and provided at one side of the safety casing spider with crank arms 29 and 30. The crank arms 29 and 30 are `reversely arranged, the crank arm 29 extending upwardly and the crank arm 30 extending downwardly. These crank arms are connected by a connecting rod 31 and are caused to move in unison to raise and lower the crank bends similitaneously. The crank arm 29 is also connected byv a link 32 with an operating lever 33 arranged in an upright position at one end of the safety casing spider and pivoted at its lower end on the adjacent transverse pivot 19 and adapted to be held by the operator for maintaining the crank bends, the links and the hinged arms 12 and 13 and the slip in an elevated position. The slip is spread or expanded when in such elevated position and is adapted to permit the casing and its couplings to be lowered through it. Should, however, anything happen requiring the casing to be grippe and held it is only necessary for the operator to release the operating lever and the weight of the slip will cause the same to automatically engage and grip the casing andthe heavier the casing and the vgreater the pressure exerted by the casing on the device the more securel'ywill the casing be held by the slip. The guiding dowel pins cause a uniform movement of the sections of the slip in their automatic engagement with the casing and the latter will'be securely gripped and held without liability of bending, cushioning or otherwise injuringthe casing and when kthe 'safety casing `spider operates automatically and engages .provided on their exterior with dovetailed ribs '35 to fit in dovetailed grooves of tbc ring l and provided at their inner faces with dovetailed grooves 36 and 37 to re ceive dovetailed ribs of a .smaller slip 38 as clearly illustrated in Fig. 4 of the drawings. lVhile only one liner and one slip are illustrated in Fig. 4 of the drawings lthe number of liners may be varied aswill be readily understood to equip the safety casing spider with a slip of the desired size to receive the casino' to be handled. The dovetailed grooves 3l ot' the liners are preferably formed "by recessingthe inner faces of the sections of the liner at the side edges thereof asshown and the dovetailed ribs are preferably tapered at their'low'er ends 39 to facilitate Atheir ready insertion in the dovetailed grooves.

In order to enable the operating mechanism to be'connected with slips of different diameters the upper hinged arms are composed of separate overlapping sections each having a plurality of perforations 4() to receive one lor more bolts 41 forsecuring the sections of the upper hinged arins in theirvadjustment. By this construction the upper hinged arms are adapted to be varied in length to arrange the eyes of their upper ends in proper position to receive the pivots of slips of different diameters.

c it is secured and lifted sufliciently to permit lower arms an expansion of the slip.

What is claimed is:

l. A safety casing spider including a base, an interiorly tapered rin a tapered slip composed ofsections slidably interlocke with the ring and movable upwardly and downwardly to spread and close the slip and operating means comprising upper and lower arms hinged together at their adjacentends, the upper ends of the upper arms being connected to the slip at diametrically opposite points and the lower ends of the lower arms being hinged to the base, rock shafts-supported by the base located below the upper arms and provided with crank elements, links connect-ing the crank elements with the upper arms, and operating means mounted on the base connected with the rock shafts for simultaneously rotating the same to raise or lower the slip.

2. A safety casing spider including a base, an interiorly tapered ring, a tapered slip composed of sections slidably interlocked with the ring and movable upwardly and downwardly to spread and close the slip and operatin means comprising upper and inged together at their adjacent ends, the upper ends of the upper arms being connected to the slip at diametrically opposite points and the lower ends of the lower arms being hinged to the base, rock shafts supported by the base arranged below the-upper arms and provided with crank bends and having terminal crank arms, one of the crank arms being extended upwardly and the other downwardly, links connecting the crank bends with the upper hinged arms, a rod connecting the terminal crank arms of the rock shafts, and an operating lever mounted on t-he base connected with the terminal arm of one of the rock shafts.

A safety casing s ider including a su port, a slip compose of sections movab e upwardly and downwardly to spread and close the same, means for guiding the sections, operating mechanism connected with the sections for raising and lowering the same, said operating mechanism comprising upper and lower arms hinged to ethery at their adjacent ends, the upper en s of the upper arms being connected to the slip and the lower 'ends of the lower arms being hin ed to the support, crank elements carlriez? by the support and located below the vup r arms and connected with the same an a manually operable member mounted pn the support and connected with the crank elements for simultaneously operating the same to raise and lower the slip.

4. A safety casing spider including a support, a slip composed of sections movable upwardly and downwardly to spread and close the same, means for guiding;v the sections, operating mechanism conr ccted with the sections for raising and lowering the same, said operating mechanism comprising upper and lower arms'hinged t ether at their adjacent ends, theupper en of the upper arms being connected to the sli and the lower ends of the lower arms hinged to the support, rock shafts moun on the supports and located below the upper arms an links connecting the crank elements with the upper arms) and operating means mounted on the support and-connected with the rock shafts to simultaneously rotate the same to raise or lower the slip.

5. A safety casing s ider including a su port, a slip compo of sections movab e upwardly and downwardly to spread and close the same, means for guiding the sections, operating mechanism connected with the sections for raising and lowering the same, said o erating mechanism com rising upper and ower arms hinged to et er at their adjacent ends, theupper en s of the upper-arms being connected to the sli and the lower endsl of the lower arms in hin ed to the support, rock shafts mount on t e supports and arranged below the u per arms and provided with the crank ben and having terminal crank arms, one of the crank arms being extended upwardly and the other downwardly, links connecting the crank bends =with the upper arms, a rod connecting the terminal crank arms of the rock shafts, and an 'operating lever mounted on the support and connected with the terminal arm of one of the rock shafts.

In testimony whereof I have hereunto set my hand. X

JALIES S. TAYLOR.

provided withcrank elements, 

